from django.shortcuts import render
from rest_framework import status
from rest_framework.generics import GenericAPIView, CreateAPIView
from rest_framework.response import Response
from rest_framework.views import APIView

from cart.untils import merge_cookie_cart_to_redis
from oauth.exceptions import QQAPIError
from oauth.models import OAuthQQUser
from oauth.serializers import QQAuthUserSerializer
from oauth.utils import OAuthQQ
# Create your views here.


#获取QQ登录用户openid并处理
# GET /oauth/qq/user/?code=<code>
class QQAuthUserView(GenericAPIView):
# class QQAuthUserView(CreateAPIView):
    #指定当前视图所使用的序列化器类
    serializer_class = QQAuthUserSerializer

    # def post(self,request,*args,**kwargs):
    #     #调用’CreateAPIView 中post
    #     response = super().create(request)
    #     #调用合并购物车函数
    #     user = self.user
    #     merge_cookie_cart_to_redis(request, user, response)
    #     return response


    def post(self,request):
        '''
        保存QQ登录绑定数据：
        １.获取参数并进行校验(参数完整性，手机号格式，短信验证码是否正确，access_token是否有效)
        2.保存QQ绑定的数据并生成jwt token
        3.返回应答,绑定成功

        '''
        #１.获取参数并进行校验(参数完整性，手机号格式，短信验证码是否正确，access_token是否有效)
        serializer = self.get_serializer(data = request.data)
        serializer.is_valid(raise_exception=True)

        # 2.保存QQ绑定的数据并生成jwt token
        serializer.save()

        # 3.返回应答,绑定成功
        response = Response(serializer.data,status=status.HTTP_201_CREATED)

        #调用合并购物车记录函数
        user = self.user
        merge_cookie_cart_to_redis(request, user, response)
        return response





    def get(self,request):
        '''
        获取QQ登录用户openid并处理
        1. 获取code并校验（code必传）
        2.获取QQ登录用户的openid
            2.1 通过code请求QQ服务器获取access_token
            2.2 通过access_token请求QQ服务器获取openid
        3.根据openid判断是否绑定本网站的用户
            3.1 如果已绑定,直接生成jwt token,并返回
            3.2 如果未绑定,将openid加密并返回
        '''
        #1. 获取code并校验（code必传）
        code = request.query_params.get('code') #None
        if code is None:
            return Response({'message':'缺少code参数'},status=status.HTTP_400_BAD_REQUEST)
        # 2.获取QQ登录用户的openid
        oauth = OAuthQQ()

        try:
            #2.1 通过code请求QQ服务器获取access_token
            access_token = oauth.get_access_token(code)

            #2.2 通过access_token请求QQ服务器获取openid
            openid = oauth.get_openid(access_token)
        except QQAPIError:
            return Response({'message':'QQ登录异常'},status=status.HTTP_503_SERVICE_UNAVAILABLE)
        # 3.根据openid判断是否绑定本网站的用户
        try:
            qq_user = OAuthQQUser.objects.get(openid=openid)
        except OAuthQQUser.DoesNotExist:
            # 3.2 如果未绑定,将openid加密并返回
            secret_openid = OAuthQQ.generate_save_user_token(openid)
            return Response({'access_token':secret_openid})
        else:
            ##3.1 如果已绑定,直接生成jwt token,并返回
            user = qq_user.user
            # 由服务器生成一个jwt token，保存用户身份信息
            from rest_framework_jwt.settings import api_settings

            # 生成payload的方法
            jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
            # 生成jwt token的方法
            jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

            # 生成payload
            payload = jwt_payload_handler(user)
            # 生成jwt token
            token = jwt_encode_handler(payload)

            #返回应答
            res_data = {
                'user_id':user.id,
                'username':user.username,
                'token':token
            }
            response = Response(res_data)

            # 调用合并购物车记录函数

            merge_cookie_cart_to_redis(request,user,response)
            return response


#获取QQ登录网址
# GET /oauth/qq/authorization/?next=<登录之后访问页面地址>

class QQAuthURLView(APIView):
    def get(self,request):
        '''
        获取QQ登录网址：
        １.获取next
        2.组织QQ登录网址和参数
        3.返回QQ登录网址
        '''
        # １.获取next
        next = request.query_params.get('next','/')
        # 2.组织QQ登录网址和参数
        oauth = OAuthQQ(state=next)
        login_url = oauth.get_login_url()
        # 3.返回QQ登录网址
        return Response({'login_url':login_url})